<template>
  <div>
    <!-- 三级分类全局组件 -->
    <Category :scene="scene" />
    <el-card style="margin:10px 0px">
      <div v-show="scene == 0">
        <el-button @click="addAttr" type="primary" size="default" icon="Plus"
                   :disabled="categoryStore.c3Id ? false : true">添加属性</el-button>
        <el-table border style="margin:10px 0px" :data="attrArr">
          <el-table-column label="序号" type="index" align="center" width="80px"></el-table-column>
          <el-table-column label="属性名称" width="120px" prop="attrName"></el-table-column>
          <el-table-column label="属性值名称">
            <template #="{ row, $index }">
              <el-tag style="margin:5px" v-for="(item, index) in row.attrValueList" :key="item.id">{{
                  item.valueName }}</el-tag>
            </template>
          </el-table-column>
          <el-table-column label="操作" width="120px">
            <!-- row：已有的属性对象 -->
            <template #="{ row, $index }">
              <!-- 修改已有属性的按钮 -->
              <el-button type="primary" size="small" icon="Edit" @click="updateAttr(row)"></el-button>
              <el-popconfirm :title="`你确定删除${row.attrName}?`" width="200px" @confirm="deleteAttr(row.id)">
                <template #reference>
                  <el-button type="primary" size="small" icon="Delete"></el-button>
                </template>
              </el-popconfirm>
            </template>
          </el-table-column>
        </el-table>
      </div>
      <div v-show="scene == 1">
        <!-- 展示添加属性与修改数据的结构 -->
        <el-form :inline="true">
          <el-form-item label="属性名称">
            <el-input placeholder="请你输入属性名称" v-model="attrParams.attrName"></el-input>
          </el-form-item>
        </el-form>
        <el-button @click="addAttrValue" :disabled="attrParams.attrName ? false : true" type="primary"
                   size="default" icon="Plus">添加属性值</el-button>
        <el-button type="primary" size="default" @click="cancel">取消</el-button>
        <el-table border style="margin:10px 0px" :data="attrParams.attrValueList">
          <el-table-column label="序号" width="80px" type="index" align="center"></el-table-column>
          <el-table-column label="属性值名称">
            <!-- row:即为当前属性值对象 -->
            <template #="{ row, $index }">
              <el-input :ref="(vc: any) => inputArr[$index] = vc" v-if="row.flag" @blur="toLook(row, $index)"
                        size="small" placeholder="请你输入属性值名称" v-model="row.valueName"></el-input>
              <div v-else @click="toEdit(row, $index)">{{ row.valueName }}</div>
            </template>
          </el-table-column>
          <el-table-column label="属性值操作">
            <template #="{ row, index }">
              <el-button type="primary" size="small" icon="Delete"
                         @click="attrParams.attrValueList.splice(index, 1)"></el-button>
            </template>
          </el-table-column>
        </el-table>
        <el-button type="primary" size="default" @click="save"
                   :disabled="attrParams.attrValueList.length > 0 ? false : true">保存</el-button>
        <el-button type="primary" size="default" @click="cancel">取消</el-button>
      </div>
    </el-card>
  </div>
</template>

<script setup lang="ts">
  //组合式API函数watch
  import { watch, ref, reactive, nextTick, onBeforeUnmount } from 'vue';
  //引入获取已有属性与属性值接口
  import { reqAttr, reqAddOrUpdateAttr, reqRemoveAttr } from '@/api/product/attr';
  import type { AttrResponseData, Attr, AttrValue } from '@/api/product/attr/type';
  //获取分类的仓库
  import useCategoryStore from '@/stores/modules/category';
  import { ElMessage } from 'element-plus';
  let categoryStore = useCategoryStore();
  //存储已有的属性与属性值
  let attrArr = ref<Attr[]>([]);
  //定义card组件内容切换变量
  let scene = ref<number>(0);//scene=0,显示table,scene=1,展示添加与修改属性结构
  //收集新增的属性的数据
  let attrParams = reactive<Attr>({
    attrName: "",//新增的属性的名字
    attrValueList: [//新增的属性值数组
    ],
    categoryId: '',//三级分类的ID
    categoryLevel: 3,//代表的是三级分类
  })
  //准备一个数组:将来存储对应的组件实例el-input
  let inputArr = ref<any>([]);
  //监听仓库三级分类ID变化
  watch(() => categoryStore.c3Id, () => {
    //清空上一次查询的属性与属性值
    attrArr.value = [];
    //保证三级分类得有才能发请求
    if (!categoryStore.c3Id) return;
    //获取分类的ID
    getAttr();
  })
  //获取已有的属性与属性值方法
  const getAttr = async () => {
    const { c1Id, c2Id, c3Id } = categoryStore;
    //获取分类下的已有的属性与属性值
    let result: AttrResponseData = await reqAttr(c1Id, c2Id, c3Id);
    if (result.code == 200) {
      attrArr.value = result.data;
    }
  }
  //添加属性按钮的回调
  const addAttr = () => {
    //每一次点击的时候,先清空一下数据再收集数据
    Object.assign(attrParams, {
      attrName: "",//新增的属性的名字
      attrValueList: [//新增的属性值数组
      ],
      categoryId: categoryStore.c3Id,//三级分类的ID
      categoryLevel: 3,//代表的是三级分类
    })
    //切换为添加与修改属性的结构
    scene.value = 1;
  }
  //table表格修改已有属性按钮的回调
  const updateAttr = (row: Attr) => {
    //切换为添加与修改属性的结构
    scene.value = 1;
    //将已有的属性对象赋值给attrParams对象即为
    //ES6->Object.assign进行对象的合并
    Object.assign(attrParams, JSON.parse(JSON.stringify(row)));
  }
  //取消按钮的回调
  const cancel = () => {
    scene.value = 0;
  }
  //添加属性值按钮的回调
  const addAttrValue = () => {
    //点击添加属性值按钮的时候,向数组添加一个属性值对象
    attrParams.attrValueList.push({
      valueName: '',
      flag: true,//控制每一个属性值编辑模式与切换模式的切换
    });
    //获取最后el-input组件聚焦
    nextTick(() => {
      inputArr.value[attrParams.attrValueList.length - 1].focus();
    })

  }
  //保存按钮的回调
  const save = async () => {
    //发请求
    let result: any = await reqAddOrUpdateAttr(attrParams);
    //添加属性|修改已有的属性已经成功
    if (result.code == 200) {
      //切换场景
      scene.value = 0;
      //提示信息
      ElMessage({
        type: 'success',
        message: attrParams.id ? '修改成功' : '添加成功'
      });
      //获取全部已有的属性与属性值
      getAttr();
    } else {
      ElMessage({
        type: 'error',
        message: attrParams.id ? '修改失败' : '添加失败'
      })
    }
  }

  //属性值表单元素失却焦点事件回调
  const toLook = (row: AttrValue, $index: number) => {

    //非法情况判断1
    if (row.valueName.trim() == '') {
      //删除调用对应属性值为空的元素
      attrParams.attrValueList.splice($index, 1);
      //提示信息
      ElMessage({
        type: 'error',
        message: '属性值不能为空'
      })
      return;
    }
    //非法情况2
    let repeat = attrParams.attrValueList.find((item) => {
      //切记把当前失却焦点属性值对象从当前数组扣除判断
      if (item != row) {
        return item.valueName === row.valueName;
      }
    });

    if (repeat) {
      //将重复的属性值从数组当中干掉
      attrParams.attrValueList.splice($index, 1);
      //提示信息
      ElMessage({
        type: 'error',
        message: '属性值不能重复'
      })
      return;
    }
    //相应的属性值对象flag:变为false,展示div
    row.flag = false;
  }

  //属性值div点击事件
  const toEdit = (row: AttrValue, $index: number) => {
    //相应的属性值对象flag:变为true,展示input
    row.flag = true;
    //nextTick:响应式数据发生变化,获取更新的DOM(组件实例)
    nextTick(() => {
      inputArr.value[$index].focus();
    })

  }

  //删除某一个已有的属性方法回调
  const deleteAttr = async (attrId: number) => {

    //发相应的删除已有的属性的请求
    let result: any = await reqRemoveAttr(attrId);
    //删除成功
    if (result.code == 200) {
      ElMessage({
        type: 'success',
        message: '删除成功'
      })
      //获取一次已有的属性与属性值
      getAttr();
    } else {
      ElMessage({
        type: 'error',
        message: '删除失败'
      })
    }
  }

  //路由组件销毁的时候，把仓库分类相关的数据清空
  onBeforeUnmount(() => {
    //清空仓库的数据
    categoryStore.$reset();
  })
</script>

<style scoped></style>
